**Use the following trick to save the hidden characters so they do not have to be unlocked again... Unlock the desired characters in Arcade mode. Go to the character selection screen. Pause game play, then exit the game. The unlocked characters will be available for the remainder of your game session. When you start the game again, you must first enter Arcade mode to load the previously unlocked characters. You can play with the unlocked characters online. NOT GOING INTO ARCADE MODE FIRST WILL RESULT IN THOSE CHARACTERS BEING REMOVED AS PLAYABLE.**